A Comparative Study on the Detectability between Haptic and Auditory Signals under Driving and Non-driving Task Conditions

Intelligibility of Haptic Signals in Vehicle Information Systems

“…To confirm the first hypothesis, an emotional evaluation was performed on the haptic signal through KW. In the haptic signal design, the two parameters (frequency, acceleration) were independent of each other, and the detection range was confirmed through prior research [ 11 ]. In addition, because a previous study conducted work in which the driver discriminated between four signals at once [ 12 ], the experiment was configured so that four different signals were presented in one block.…”

“…Acceleration can be adjusted by changing the voltage applied to the actuator, and frequency can be determined by adjusting the interval between signals as a parameter for how many signals are generated per second. The range of two independent parameters was designed to discriminate haptic signals within the frequency range of 80–250 Hz and the acceleration range of 2–5 G, according to previous studies [ 11 , 12 ]. For the haptic signal, the actuator Mark-II was selected by considering signal change range and a precision suitable for the research purposes.…”

“…Signals with secured intelligibility should be able to be combined with signals from other sensory organs and standardized to make perfect signals. In the past, studies have been conducted to confirm the detectability of haptic signals, and they have shown them to be similar to auditory signals [ 11 ]. In terms of discriminability, it has been reported that a maximum of four haptic signals can be discriminated [ 12 ].…”